by Michael Winter, USATODAY

by Michael Winter, USATODAY

Police say a boy charged with aggravated assault in a Philadelphia high school gym shooting turned himself in Saturday.

Security cameras recorded two Philadelphia students being shot and wounded by a classmate in a high school gymnasium Friday afternoon, police said.

A boy who was originally a suspect was detained, but later cleared, Police Commissioner Charles Ramsey told the Philadelphia Inquirer on Friday night. Another student turned himself in Friday and remained in custody Saturday. He had not yet been charged.

Police Lt. John Stanford said at a news briefing that each victim was hit once in an arm, and they were taken to Albert Einstein Medical Center, two blocks away. The girl was discharged hours later, and the boy was listed in stable condition.

Surveillance video showed three youths together and one pulling out a handgun. But Ramsey said it was not yet clear which one pulled the trigger, how many shots were fired or whether the shooting was intentional or accidental.

Seven students were in the gym at the time.

The wounded girl went into the bathroom moments afterward, and there was "just a lot of blood gushing out," a friend told WPVI-TV.

"She was saying she heard a loud boom in the gym room and she looked up and her boyfriend's arm had been hit," the friend said.

The school, for grades 9 through 12, was placed on lockdown. The 600 students were searched and released individually. Police initially said the shooter was still inside the school but said later that he had fled, prompting a search by officers and SWAT teams.

The school is equipped with metal detectors, and police and school officials were trying to determine how the suspect got the gun inside.